diff --git a/ui/acp/generate-schema.ts b/ui/acp/generate-schema.ts
index 3a5fe238ef..08cd402a4c 100644
--- a/ui/acp/generate-schema.ts
+++ b/ui/acp/generate-schema.ts
@@ -79,6 +79,9 @@ async function main() {
   await postProcessTypes();
   await postProcessIndex(meta);
 
+  // 5. Generate typed client wrapper
+  await generateClient(meta);
+
   console.log(`\nGenerated Goose extension schema in ${OUTPUT_DIR}`);
 }
 
@@ -101,6 +104,9 @@ async function postProcessIndex(meta: { methods: unknown[] }) {
     return "";
   });
 
+  // Fix bare relative imports to use .js extensions (required by nodenext consumers)
+  src = fixRelativeImports(src);
+
   // Append method constants
   const methodConstants = await prettier.format(
     `
@@ -112,4 +118,138 @@ export type GooseExtMethod = (typeof GOOSE_EXT_METHODS)[number];
   );
 
   await fs.writeFile(indexPath, `${src}\n${methodConstants}`);
+
+  // Also fix imports in zod.gen.ts (it may import from types.gen)
+  for (const file of ["zod.gen.ts", "types.gen.ts"]) {
+    const filePath = resolve(OUTPUT_DIR, file);
+    try {
+      const content = await fs.readFile(filePath, "utf8");
+      const fixed = fixRelativeImports(content);
+      if (fixed !== content) {
+        await fs.writeFile(filePath, fixed);
+      }
+    } catch {
+      // File may not exist
+    }
+  }
+}
+
+function fixRelativeImports(src: string): string {
+  return src.replace(
+    /from\s+['"](\.[^'"]+)['"]/g,
+    (_match, importPath: string) => {
+      if (importPath.endsWith(".js") || importPath.endsWith(".json")) {
+        return `from '${importPath}'`;
+      }
+      return `from '${importPath}.js'`;
+    },
+  );
+}
+
+interface MethodMeta {
+  method: string;
+  requestType: string | null;
+  responseType: string | null;
+}
+
+/**
+ * Convert a method path like "session/list" or "working_dir/update" to camelCase "sessionList", "workingDirUpdate".
+ */
+function methodToCamelCase(method: string): string {
+  return method
+    .split(/[/_]/)
+    .map((part, i) =>
+      i === 0 ? part : part.charAt(0).toUpperCase() + part.slice(1),
+    )
+    .join("");
+}
+
+/**
+ * Generate a typed GooseClient class that wraps ClientSideConnection.extMethod()
+ * with proper TypeScript types and Zod runtime validation.
+ */
+async function generateClient(meta: { methods: MethodMeta[] }) {
+  const typeImports = new Set<string>();
+  const zodImports = new Set<string>();
+
+  const methodDefs: string[] = [];
+
+  for (const m of meta.methods) {
+    const fnName = methodToCamelCase(m.method);
+    const fullMethod = `_goose/${m.method}`;
+
+    // Build param type and arg
+    let paramType = "";
+    let paramArg = "";
+    let callParams = "{}";
+    if (m.requestType) {
+      typeImports.add(m.requestType);
+      paramType = m.requestType;
+      paramArg = `params: ${paramType}`;
+      callParams = "params";
+    }
+
+    // Build return type and validation
+    let returnType: string;
+    let bodyLines: string[];
+
+    if (m.responseType && m.responseType !== "EmptyResponse") {
+      typeImports.add(m.responseType);
+      const zodName = `z${m.responseType}`;
+      zodImports.add(zodName);
+      returnType = m.responseType;
+      bodyLines = [
+        `const raw = await this.conn.extMethod("${fullMethod}", ${callParams});`,
+        `return ${zodName}.parse(raw) as ${returnType};`,
+      ];
+    } else if (m.responseType === "EmptyResponse") {
+      returnType = "void";
+      bodyLines = [
+        `await this.conn.extMethod("${fullMethod}", ${callParams});`,
+      ];
+    } else {
+      // Both request and response are untyped (serde_json::Value)
+      returnType = "Record<string, unknown>";
+      bodyLines = [
+        `return await this.conn.extMethod("${fullMethod}", ${callParams ? callParams : "{}"});`,
+      ];
+    }
+
+    methodDefs.push(`
+  async ${fnName}(${paramArg}): Promise<${returnType}> {
+    ${bodyLines.join("\n    ")}
+  }`);
+  }
+
+  const typeImportLine = typeImports.size
+    ? `import type { ${[...typeImports].sort().join(", ")} } from "./types.gen.js";`
+    : "";
+  const zodImportLine = zodImports.size
+    ? `import { ${[...zodImports].sort().join(", ")} } from "./zod.gen.js";`
+    : "";
+
+  let src = `// This file is auto-generated — do not edit manually.
+
+export interface ExtMethodProvider {
+  extMethod(method: string, params: Record<string, unknown>): Promise<Record<string, unknown>>;
+}
+
+${typeImportLine}
+${zodImportLine}
+
+/**
+ * Typed client for Goose custom extension methods.
+ * Wraps an ExtMethodProvider (e.g. ClientSideConnection) with proper types and Zod validation.
+ */
+export class GooseClient {
+  constructor(private conn: ExtMethodProvider) {}
+${methodDefs.join("\n")}
+}
+`;
+
+  src = await prettier.format(src, { parser: "typescript" });
+  src = fixRelativeImports(src);
+
+  const clientPath = resolve(OUTPUT_DIR, "client.gen.ts");
+  await fs.writeFile(clientPath, src);
 }
diff --git a/ui/acp/package-lock.json b/ui/acp/package-lock.json
index 6bcc518309..3eb6dc181f 100644
--- a/ui/acp/package-lock.json
+++ b/ui/acp/package-lock.json
@@ -11,10 +11,24 @@
         "zod": "^3.25.76"
       },
       "devDependencies": {
+        "@agentclientprotocol/sdk": "^0.14.1",
         "@hey-api/openapi-ts": "^0.92.3",
         "prettier": "^3.8.1",
         "tsx": "^4.21.0",
         "typescript": "~5.9.3"
+      },
+      "peerDependencies": {
+        "@agentclientprotocol/sdk": "*"
+      }
+    },
+    "node_modules/@agentclientprotocol/sdk": {
+      "version": "0.14.1",
+      "resolved": "https://global.block-artifacts.com/artifactory/api/npm/square-npm/@agentclientprotocol/sdk/-/sdk-0.14.1.tgz",
+      "integrity": "sha512-b6r3PS3Nly+Wyw9U+0nOr47bV8tfS476EgyEMhoKvJCZLbgqoDFN7DJwkxL88RR0aiOqOYV1ZnESHqb+RmdH8w==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "peerDependencies": {
+        "zod": "^3.25.0 || ^4.0.0"
       }
     },
     "node_modules/@esbuild/aix-ppc64": {
diff --git a/ui/acp/package.json b/ui/acp/package.json
index e1f1f2de98..fc258fd648 100644
--- a/ui/acp/package.json
+++ b/ui/acp/package.json
@@ -14,7 +14,11 @@
   "dependencies": {
     "zod": "^3.25.76"
   },
+  "peerDependencies": {
+    "@agentclientprotocol/sdk": "*"
+  },
   "devDependencies": {
+    "@agentclientprotocol/sdk": "^0.14.1",
     "@hey-api/openapi-ts": "^0.92.3",
     "prettier": "^3.8.1",
     "tsx": "^4.21.0",
diff --git a/ui/acp/src/generated/client.gen.ts b/ui/acp/src/generated/client.gen.ts
new file mode 100644
index 0000000000..db0ae5eb21
--- /dev/null
+++ b/ui/acp/src/generated/client.gen.ts
@@ -0,0 +1,129 @@
+// This file is auto-generated — do not edit manually.
+
+export interface ExtMethodProvider {
+  extMethod(
+    method: string,
+    params: Record<string, unknown>,
+  ): Promise<Record<string, unknown>>;
+}
+
+import type {
+  AddExtensionRequest,
+  DeleteSessionRequest,
+  ExportSessionRequest,
+  ExportSessionResponse,
+  GetExtensionsResponse,
+  GetSessionRequest,
+  GetSessionResponse,
+  GetToolsRequest,
+  GetToolsResponse,
+  ImportSessionRequest,
+  ImportSessionResponse,
+  ListSessionsResponse,
+  ReadResourceRequest,
+  ReadResourceResponse,
+  RemoveExtensionRequest,
+  UpdateWorkingDirRequest,
+} from './types.gen.js';
+import {
+  zExportSessionResponse,
+  zGetExtensionsResponse,
+  zGetSessionResponse,
+  zGetToolsResponse,
+  zImportSessionResponse,
+  zListSessionsResponse,
+  zReadResourceResponse,
+} from './zod.gen.js';
+
+/**
+ * Typed client for Goose custom extension methods.
+ * Wraps an ExtMethodProvider (e.g. ClientSideConnection) with proper types and Zod validation.
+ */
+export class GooseClient {
+  constructor(private conn: ExtMethodProvider) {}
+
+  async extensionsAdd(params: AddExtensionRequest): Promise<void> {
+    await this.conn.extMethod("_goose/extensions/add", params);
+  }
+
+  async extensionsRemove(params: RemoveExtensionRequest): Promise<void> {
+    await this.conn.extMethod("_goose/extensions/remove", params);
+  }
+
+  async tools(params: GetToolsRequest): Promise<GetToolsResponse> {
+    const raw = await this.conn.extMethod("_goose/tools", params);
+    return zGetToolsResponse.parse(raw) as GetToolsResponse;
+  }
+
+  async resourceRead(
+    params: ReadResourceRequest,
+  ): Promise<ReadResourceResponse> {
+    const raw = await this.conn.extMethod("_goose/resource/read", params);
+    return zReadResourceResponse.parse(raw) as ReadResourceResponse;
+  }
+
+  async workingDirUpdate(params: UpdateWorkingDirRequest): Promise<void> {
+    await this.conn.extMethod("_goose/working_dir/update", params);
+  }
+
+  async sessionList(): Promise<ListSessionsResponse> {
+    const raw = await this.conn.extMethod("_goose/session/list", {});
+    return zListSessionsResponse.parse(raw) as ListSessionsResponse;
+  }
+
+  async sessionGet(params: GetSessionRequest): Promise<GetSessionResponse> {
+    const raw = await this.conn.extMethod("_goose/session/get", params);
+    return zGetSessionResponse.parse(raw) as GetSessionResponse;
+  }
+
+  async sessionDelete(params: DeleteSessionRequest): Promise<void> {
+    await this.conn.extMethod("_goose/session/delete", params);
+  }
+
+  async sessionExport(
+    params: ExportSessionRequest,
+  ): Promise<ExportSessionResponse> {
+    const raw = await this.conn.extMethod("_goose/session/export", params);
+    return zExportSessionResponse.parse(raw) as ExportSessionResponse;
+  }
+
+  async sessionImport(
+    params: ImportSessionRequest,
+  ): Promise<ImportSessionResponse> {
+    const raw = await this.conn.extMethod("_goose/session/import", params);
+    return zImportSessionResponse.parse(raw) as ImportSessionResponse;
+  }
+
+  async configExtensions(): Promise<GetExtensionsResponse> {
+    const raw = await this.conn.extMethod("_goose/config/extensions", {});
+    return zGetExtensionsResponse.parse(raw) as GetExtensionsResponse;
+  }
+
+  async toolCall(): Promise<Record<string, unknown>> {
+    return await this.conn.extMethod("_goose/tool/call", {});
+  }
+
+  async providerUpdate(): Promise<Record<string, unknown>> {
+    return await this.conn.extMethod("_goose/provider/update", {});
+  }
+
+  async containerSet(): Promise<Record<string, unknown>> {
+    return await this.conn.extMethod("_goose/container/set", {});
+  }
+
+  async appsList(): Promise<Record<string, unknown>> {
+    return await this.conn.extMethod("_goose/apps/list", {});
+  }
+
+  async appsExport(): Promise<Record<string, unknown>> {
+    return await this.conn.extMethod("_goose/apps/export", {});
+  }
+
+  async appsImport(): Promise<Record<string, unknown>> {
+    return await this.conn.extMethod("_goose/apps/import", {});
+  }
+
+  async configProviders(): Promise<Record<string, unknown>> {
+    return await this.conn.extMethod("_goose/config/providers", {});
+  }
+}
diff --git a/ui/acp/src/generated/index.ts b/ui/acp/src/generated/index.ts
index c1b3caff80..b44b568427 100644
--- a/ui/acp/src/generated/index.ts
+++ b/ui/acp/src/generated/index.ts
@@ -1,6 +1,6 @@
 // This file is auto-generated by @hey-api/openapi-ts
 
-export type { AddExtensionRequest, DeleteSessionRequest, EmptyResponse, ExportSessionRequest, ExportSessionResponse, ExtRequest, ExtResponse, GetExtensionsResponse, GetSessionRequest, GetSessionResponse, GetToolsRequest, GetToolsResponse, ImportSessionRequest, ImportSessionResponse, ListSessionsResponse, ReadResourceRequest, ReadResourceResponse, RemoveExtensionRequest, UpdateWorkingDirRequest } from './types.gen';
+export type { AddExtensionRequest, DeleteSessionRequest, EmptyResponse, ExportSessionRequest, ExportSessionResponse, ExtRequest, ExtResponse, GetExtensionsResponse, GetSessionRequest, GetSessionResponse, GetToolsRequest, GetToolsResponse, ImportSessionRequest, ImportSessionResponse, ListSessionsResponse, ReadResourceRequest, ReadResourceResponse, RemoveExtensionRequest, UpdateWorkingDirRequest } from './types.gen.js';
 
 export const GOOSE_EXT_METHODS = [
   {
diff --git a/ui/acp/src/index.ts b/ui/acp/src/index.ts
index e84c86c641..04ae78458e 100644
--- a/ui/acp/src/index.ts
+++ b/ui/acp/src/index.ts
@@ -1 +1,3 @@
-export * from "./generated";
+export * from "./generated/index.js";
+export * from "./generated/zod.gen.js";
+export { GooseClient } from "./generated/client.gen.js";